I found a picture of it in the page 88 of MSX Magazine 1984-10. Attached.

I can't read Nihongo, but at the price of 1.090.000 JPY I think this Robot Arm was not manufactured to be an MSX peripheral, nor intended to be controlled by an 8-bit machine. Even the control unit using RS-232C.

This way, I think it was pictured in the article of MSX Magazine just for comparison/reference.

Maybe you could review the listing of it as MSX Hardware, or then just add a note mentioning the article in MSX Magazine 1984-10 page 88.

You will find a lot of information and videos about it on the internet, but none related to MSX :-/